OK, so I went back to review my charges and I have to correct myself... the original AR$ charge posted on October 3rd, so its now the 11th and still no adjustment. I called US Platinum Card Member Services and the agent (obviously) had no clue what I was talking about... she explained that Exchange Rates are calculated automatically and that there is nothing that AmEx can do about the exchange rate.... which all sounds kind of weird, as AmEx clearly is participating in this scheme. Im not sure where I can take this as a next step, perhaps there is some sort of delay and this will end up posting in a few days..... (sigh)